Limestone packed tumbling drums for acidity reduction

摘要: Two independent investigations attest the capability of properly designed limestone barriers to neutralize acidic streams.1,2 Total costs for treatment are typically an order magnitude lower than those conventional processes.2 Encouraged by these successes, Pennsyl vania Department Environmental Resources has undertaken wider studies into use crushed streams. Water-powered tumbling drums and downflow upflow fluidized filter-type beds being as process units, well proven barriers. These which be constructed in Quakake Tunnel dis charge near Hazelton, Pa., will evaluated monitoring their performance over a sufficient period confirm long-term operating characteristics. Tumbling have special advantages units acid drainage from underground abandoned mines where hydraulic head is available. This can occur case pumped discharges or slope tunnel charges bulkhead plug stalled. The used power dynamic such beds. In collision between particles dual effect removing coatings stone surface that otherwise inhibit per formance abrading fines highly effective neutralization. Another advantage often more finely may feasible with permeable Barriers must usually coarsely-crushed resist damage flood waters clogging sedi ment. continual abrasive action combine pro vide large area reactive surface, thereby greatly reducing quantity required compared static